Pumping apparatus



Nov. 2l, 1939. c. RElcHER-r 2,180,366

PUMPING APPARATUS Filed Feb. 14, 1938 2 Sheets-Sheet 1 l@ j Il 48 INVENTOR.

A TTORNEYS.`

` INVENTOR. @h/

Nov. 21, 1939. c. Rr-:xcHERT PUMPING APPARATUS Filed Feb. 14, 1958 2 Shee'lzs-Sheel'I 2` Patented Nov. 21, 1939 I UMPING APPARATUS Conrad Reichert, San Antonio, Tex., assignor to Petty Laboratories, Inc., San

corporation of Texas Antonio, Tex., a

Application February' 14, isaaserial No. 190,490

16 Claims.

This invention relates to deep well pumps of the type in which a piston located deep down in the well is operated by uid pressure, thus dispensing with the usual pump rods lextending 5 from surface equipment.

It is known that'deep well pumps have been designed to be operated by a pressure from surface equipment so as to eliminate pump rods.

However, apparatus of that type has been ex-i l pensive and diiiicult to install and maintain, be-

cause of complexity in the arrangement of parts.

The present invention provides a simple arrangement of parts as will be hereinafter pointed out.

One of the features of the invention, in addi- 15 tion to that of simplicity, is the small number of parts required.

A further feature of the invention is the selfcontained installation characterized by the presence of only two tubes at the upper end of a Well hole or casing.

Another feature of the invention resides in the use and mounting of a pressure-operated power piston for operating a lifting piston, both parts being located deepdown in the well.

25 Another feature of the invention Yrelates to details of the rod connecting the power piston and lifting piston, whereby shock, due to application of pressure in the uid columns is avoided.

Still another feature of the invention relates to the combination of the above-identified pump fea-tures or surface apparatus for withdrawing pumped liquid and supplying pressure to the respective tubes in required amounts only, depending on the pressure and capacity at the power piston deep down in the well.

The above and additional d etails and features of the invention are described and claimed in the following specication and claims, and illustrated in the accompanying drawings, in which- 40 Fig. 1 represents 'a -vertical section takenv cen- 'trally through that portion of the tubing con-v section centrally through the lower portion of` the apparatus, the lifting piston or sucker and lower check valve;

Fig. 2 is a. sectional view taken on the line 2-2 of Fig. `1, showing the relative position of the two tubes and innermost working chamber;

Fig. 3 is a section taken on the line 3--3 of Fig. 1 looking in the direction of the arrows and illustrating the structure of the upper end of the lifting piston;

Fig. 4 is a sectional view taken on the line 4 4 55 of Fig. 1 looking in the direction of the arrows, and illustrating the position of the outlet at the upper end of the hollow piston rod opposite the lowermostport in the wall ofthe working chamber; and

Fig. is a view of a suitable gear driven pump for location above the earths surface for supplying pressure to the working chamber shown in Fig. 1 and for withdrawing pumped liquid.

This invention presumes the use of the customary well casing or other lining for the wall of 5 a drilled well. As one example, the apparatus illustrated in the accompanying' drawings is intended for insertion into and usel within such a casing, although theoretically the structure described and illustrated iny connection with this invention is capable of functioning without such casing.

The rapparatus herein described includes the provision of a working chamber and piston therein intended tobe located deep down in the well and which has a sucker or a lowermost lifting piston connected to the power piston by a suitable piston rod. These essential features of the invention are operated by fluid pressure from the earths surface transmitted through two passageways, comprising two tubes. The outermost of these tubes is closed at its lower end and is adapted to receive oil being forced upwardly and serves to conduct such oil to the surface. Within the outer tube and spaced from it is a second or inner tube which serves to supply pressure to the under face of the power piston within the Working chamber-to lift the power piston upwardly and thus to bring` oil upwardly into the outlet passage formed by the -inner wall of the outer tube and the outer wall of the inner tube. One feature of the operation of these essential parts is that there is a periodic downward pressure applied on the column of upwardly moving oil so that such pressure is exerted 'on the upper face of the power piston to lower the same in order that a further charge of oil may be admitted to the space above the lifting piston or sucker element. These and further features will now be more particularly described.

Referring in detail to the several figures of the drawings, I is the outer tubing, 2 is the inner tubing, and 3 represents the wall ofthe working. chamber which is shown to be cylindrical. It will be observed that the working chamber 3 is .concentric with the wall I of the outer tubing and that the inner tubing 2 is eccentrically positioned with respect to both I and 3 so that the walls 2 and 3 contact each other along one side. These two Walls may be welded or otherwise secured together along the line of contact if desired. The upper end of the working cylinder 3 is closed by a suitable plate or cap 4 secured in any suitablemanner to serve as a cylinder head. 'I'he lower end of the inner tube 2 rests on a plate 5 5 which encircles the outer wall of the wall 3 of the working chamber. Plate 5 thus servesl to close the lower end of the space within the tube 2 aboutthe wall of the working chamber 3.

Ports for the application of working fluid to 60 the power. piston are shown at 4a near the upper portion of the working chamber 3 where the port extends through the contacting walls 2 and 3, and at the lowermost portion of the working chamber at 4b on the opposite side of the working chamber.

A combination junction element serving for the mounting of several essential parts also providing ports leading from the lowermost .part of the apparatus is provided just below the plate 5 by the element 6 which servesvnot only as. a spacer for the above mentioned tubing, but also as a stufng box as will be described.- The element 6 is of peculiar` shape having an upstanding rim IEi threaded on its inner face to provide thread-engagement with the lower end of the working chamber. From that rim 6a this piece extends inwardly to provide a bearingv support vfor the piston rod and stuiiingbox inmediately therebelow and adapted to contain suitable packing, as illustrated. The lower portion of the element 6, where it is provided With'a central space for packing, is shaped as an annular sleeve Ib within which there are a series of upwardly extending ducts 6 through which oil may be moved upwardly past ball valves 6d, resting on the upper end openingsof the ducts 6C, thus serving to permit upward movement of the oil but prevent downward movement. The space immediately above the ducts-6c and ball valves 6d lead directly into the space between the inner wall of the outer tubing I and the outer wall of the inner tubing 2 `for discharge. Extending below the portion 6b, the stung box wall is extended downwardly and at its extreme end is threaded on its central face at 6e for the reception of a suitable packing gland element to hold the packing material in place.

A union element I serves to connect the wall I of the outer tubing with the wall 8 of the lower working barrel or cylinder. The union element I is shown as being tapered smaller towards its lower end where it provides an opening threaded at la for engagement with the upper threaded.-

end of the working barrel 8. The inner surface of the union element l ,is likewise taperedwth its smaller end downward, and the surface thereof serves as a seat for the support of the outer surface of the outer wall of the part 6b of the combination element 6, Withinthe enclosure of the union element 'I is a space 'Ib extending annularly around the lower end of the lcombination member 6. The ducts 5c extend upwardly from the space 1b.

The structure at the lower end of the apparatus is illustrated in Fig. 1a and includes the lower working barrel 8. At the lower extreme end of `the barrel 8 is a collar 9 which may be screw threaded to the lower end of the working barrel 8 and receive at its lower end a suitable pipe connection I0 as may be desired. Within the work-' ing barrel8, and adjacent the collar 9, is a fixed valve cage II within whichis a valve element I2 having a renewable face I3 adapted to seat on the upper edge of a valve s eat I 4 so that oil iiowing upwardly or Asucked upwardly into the Acasing may move through the valve cage II, lifting the movable parts I2 and I3 from the seat. 'Ilendency for the oil to pass downward is prevented by the seating of the parts I2 and I3 on the dge I4.

'I'he suction or'lifting part of the equipmentA includes a 'cylindrical plunger I5 having a mov- 'able valve element I5a therein, having a renewable surface IB which is adapted to rest on the upper edge of a valve seat, I1, the latter having threaded engagement with the part I5 and serving to conne suitable packing material between the cylindrical plunger and the inner wall of the working chamber 8.

The valve rod or piston rod transmits power from the Working chamber to the cylindrical plunger I5 as indicated at I8, the cylindrical plunger I5 being connected to the rod I8 with a screw threaded engagement, as illustrated. The rod I8 is peculiar in that it has a central duct I9 extending upwardly therethrough. This duct I9 serves to provide ported communication below the space in the cylindrical lifting plunger I5 and the space within the working chamber, subject to the control of the valve parts I5a and I6 at its lower end and a small ball valve 28 at its upper end, opposite an outlet opening 2I located in the wall of the rod I8, as will be described,

A power piston 22 located within the working cylinder 3 is shown conventionally in Fig. 1 as having a central plate, and at either side thereof, oppositelyv facing leather cups, these parts being positioned at the upperend of the rod I8 and held thereon by suitable nuts clamping the parts together.

Means to limit the extreme lower movement of the piston 22 is provided as follows. A coil spring 222L surrounds the rod I8 and serves to cushion the extreme lower movement of the piston. A definite limit stop for such downward movement of the piston is provided by a sleeve 22b which surrounds the rod I8 and is positioned between the spring 22a and the rod I8, and is of such a length as to prevent the piston 22 in its downward movement from closing .the port lib. As shown in Fig. 1 the sleeve 22b also closes the outlet opening 2I leadingfrom the ball valve 20 SNat the upper end of the duct I9. Upward movement of the piston 22 and rod I8 will raise the opening 2l above the upper edge of the sleeve 22h. If the weight of the sleeve 22b is not suicient, to hold it down. in the position shown in Fig. 1, it may be secured at its .outer lower mar-.

gin to the adjacent 'surface of the part 6, as by welding. Y

Means for limiting the upward movement of the piston 22 so as to cushion the same is provided by a spring 23 encircling and carried by the rod I8 and located within the upper end of the lower working cylinder 8. A sleeve 2i positionedv between the spring and the rod I8 serves to,1imit-the movement of the piston 22 upwardly by limiting the upward movement of the cylindrical plunger I5 in its upward travel and in this way the piston 22 is prevented from closing the upper port da in the working chamber. The sleeve 24, as shown, is not immovably mounted and it will function as illustrated, thus slidably mounted on the rod I8. If desired, however, it maybe secured at the lowermost end of the rod Cil I8, as for example to the upper side of the piston body I5. Next adjacent'the spring 23, for engaging the upper and lower ends thereof, are washers or rings, as shown, and which receive the end thrust of the spring 23 when the latter is compressed therebetween, as for exarnple in the extreme upper movement of the rod I8. Such washers or rings are preferably slidable on the rod I8 and serve to prevent thespring 23 from. sliding over or being caught upon the fastening or adjustingscrews or nuts of the rod I8.

Apparatus for operating the above mentioned working parts Within the well is provided by the following equipment, suitably located at the the valves 33 and 34 to control the having a piston'rod 21a mounted in suitable stuifing b ox 21h. The space at one side of the piston is connected by a'. pipe 28 with the inner tubing 2 of the well equipment. The space at the opposite side of the piston 21 is connected by a pipe 29 with the outer space within the tubing I and exteriorly of the inner tubing 2. A discharge pipe for storage is indicated at 30 and is con- "nectedto the space at opposite sides of the piston ward pipe 30 and provided with a pressure relief valve 35i serves to insure the safe discharge of oil from the pipe' 28 and inner tubing 2 if the pressure on the'working .uid therein becomes excessive. Av similar by-pass vpipe is indicated at 36, extending from the pipe 29 to the pipe 30 and has -a pressure relief valveindicated at 36.

'i Means for operating` .the valves 33 and 34' includes a moving arm 31 clamped at its lower endto the piston rod 21a and coupled-at its upper end to a horizontally extending bar 39 by means of a link-38. The bar 39 has slots therein for the reception of ioiset projections from the upper end of the connecting levers 33 and 311iL attached to and adapted to respectively operate A passage through the pipes 3|' and 32.

The general operative function of the apparatus illustratedin Fig. 5 will now-bey described. The pistonl 21 is shown in Fig. 5 as in a neutral or intermediate position. During the forward stroke of the piston 21, that is to the right, as

shown in Fig. 5, it compresses fluid and forces it through the pipe 29 into the outside tube I. Near the end ofthe forward stroke of the piston 21 the throttle valve 34 is opened and at the order to insure that there is fluid in the cylinder 26 at all times. v

The operation of the pumping parts withinthe well will now be described. When pressure isv applied by the surface apparatus throughv the pipe 23 and inner tube 2. uid is forced through the lower port 4b and pressure thus applied to the under face of the piston 22 forcing it up'- ward. During the upward stroke the-valve parts I6a and I6 in the plunger I5 will be in the closed position, and will be lifted up by the action of the piston '22. At this stage, while lthe lfluid within the lower working barrel or tube 9- is moving upward, the suction `will also cause the lowermost valve I I having the operating parts l2 'and I3 to open and .allow the lower end of the working barrel 8 to fill with fresh material to be pumped. Dining the upward stroke of the piston 22,' the uid being lifted by the plunger yI5 will pass through the chamber 1b, thence upwardly through the ducts 6 and past the ball check valves 6d and thence in to the space withinl the outer tubing I and between'it and the outer, wall of the inner tubing 2, and onward to the surface. During that time also any fluid present will be moved outwardly through the upper port 4 and become merged with the oil being passed upwardly and outwardly from the well.

At the end of the upstroke' of the piston 22 the pressure is reversed by the -sln'face equip- 25a within the working chamber above the piston. 22"- ment so that pressure vis applied through the v l the piston 22, movement of thelatter forcingthe piston rod 'I8 and the plunger I5 downwardly,

thus opening the valve parts I5 and I6 and forcing oil from the'lower part of the-tubeV 8 into thespace above the plunger I5.-

Referring to the duct. I 9 extending through the same time the throttlevalve 33 is closed by the forward motion of the arm 31, the link 38, andI the lhorizontally extending bar 39,

When the movementof the pistonl 21 is in.

-show'n in Fig. 5, the throttle valve 33 being closed,

the pressure directed through the pipe 28 to the inner tubing 2 within the well thusapplying a pressure to the under face of the power piston and serving to raise oil upwardly in the space between the'pipe, I and the pipe 2 and thence outwardly through the pipe 29. During this timey the throttle valve 34 is open 'and `the pumped Voil'may be discharged through the pipe 30 to storage.

The pressure relief valves 35n and 36I constitute means to overcome any difference inthe pressure of fluid in the pump 26-and the working cylinder 3 within the well, extremes of pressure permitting relief through valves 35* or 33l into the discharge pipe 30. The pressure relief valves 35 and. 3lL should normally be set for a slightly greater pressure than needed` to operate the power piston in `the working chamber 3 within the well.

It is important that thedischarge line"30 be positioned at a level above the cylinder 26 in ball valve 20in the upper end thereof. lAs shown,l in Fig. 1 -it will be noted that theoutlet port 2l piston rod IIB, it 'may be explained that this duct provides for the following function. It will open and in ported communication with the'space above the plunger l5 through the open upper end of the latter. Upon downward movement of the plunger I6, pressure due to the cross-sectional area of the piston rod I8 is relieved .by thefactthat fluid is permitted to escape upwardly through the duct I9 and out past the is apparently closed by reason of the fact that it is slightly below the upper .end of the' encircling sleeve 22h. However, this isonly at the extreme end of thetravel of the piston downwardly. At

all other times and through the major portion of the travel of the piston 22, the opening 2t Ais not covered and during the downward movement of the piston 22 oil passing; upwardly through the duct I9 may be discharged into the space, beneath the piston 22. Theduct permits relief of pressure which otherwise l,would exert a force against the lower end of 'thevplunger I5 during its downward travel.

In short, the

be 'observed that the lower end of the duct I9 is duct serves to relieve the pressure which would the' displacevides for the elimination of usual sucker rods, but also renders unnecessary such surface equipment as jacks and so-called central power units. The apparatus lends itself readily to use in connection with deep wells having crooked or peculiarly shaped holes by reason of the fact that the total length of the power piston and piston rod may be relatively shortascompared vto equipment having the usual sucker rod. It is noteworthy that the equipment. provides the use of two uid columns and thus requires a minimum of apparatus. l f

I claim:

1. Ina deep well pump, a lower cylinder with a lifting plunger therein for raising liquid, a piston rod for transmitting movement to lsaid lifting plunger, a cylindrical power chamber in line with said rod, a piston within said chamber and connected to said rod, an outer tubing leading to the earths surface and having walls concentric with said power chamber and in valved communication withsaid lower cylinder for the discharge passage of oil upwardly, and an inner 'tube within said outer tubing leading from the earths surface and extending alongside ofand exteriorly of said power chamber and in ported.

communication with said power chamber at a point beneath said piston, said power cylinder and said outer tube being in ported communication at a point above said piston.

2. In a deep well pump, a lower cylinder with a lifting plunger therein for raising liquid, a piston rod for transmitting movement to said lifting plunger, a cylindrical power chamber in line with said rod, a piston within said chamber and connected to said rod, an outer tube leading to the earths surface and having walls concentric with said power chamber and in valved communication with said lower cylinder for the discharge pas-- sage of oil upwardly, and an inner tube within said outer tube leading from the'earths surface and in ported communication with said power chamber at a point beneath said piston, said power cylinder and said outer tube being in ported communication at a point above said piston, said inner tube being eccentrically positioned with respect to,` said power chamber andthe walls of said inner tube and said power chamber being in contact in one region and having an opening extending through both said walls for said ported communication.

3. In a deep well pump, a lower cylinder with a lifting plunger therein for raising liquid, a piston rod for transmitting movement to said lifting plunger, a cylindrical power chamber in line with said rod, a piston within said chamber and connected to said rod, an outer tubing leading to the earths surface andV having walls concentric with said power chamber and in valved communical tion. with said lower cylinder for the discharge passage of o il upwardly, and an inner tube within said outer tubing leading from the earths surface and in ported communication with said power chamber at a point beneath said piston, -said power cylinder and said outer tube being in ported communication at a point above said piston, the upper end of said power chamber extending across a substantial area of the bore of said` in.- ner tube and being located above and in the near region of said point of ported communication.

4. In a deep well pump, a lower cylinder with a lifting plunger therein for raising liquid, a piston -rod for transmitting movement of said lifting plunger, acylindrical powervchamber in line with'said rod, a piston within said chamber and chamber at a point beneath said piston, said power cylinder and said outer tube being in ported.

communicationat a point above said piston, said inner tube being eccentrically positioned with respect to said power chamber and the walls of said inner tube and said power chamber being in contact in one region and having an opening extending through bothsaid walls for said ported communication, the upper end of said power chamber extending across a substantial area of the bore of said inner tube and being located above and in the near region of said point of ported communication.

5. In a deep well pump, a lower cylinder with a lifting plunger therein for raising liquid, a piston rod for 4transmitting movement to said lifting plunger, a cylindrical power chamber in line with said rod, a piston within said chamber and connected to said rod, an outer tubing leading to the earths surface and having walls concentric with said power chamber and in valved communication with said lower cylinder for the discharge passage of oil upwardly, an inner tube within said outer tubing leading from the earths Cil surface and extending alongside of and exteriorly of said power chamber and in ported communication with said power chamber at a point beneath said piston, said power cylinderand said outer tube being in ported communication at a point above said piston, and operating means for applying pressure alternately to the liquid within said outer tube and said inner tube whereby said' piston is moved respectively downwardly and upwardly to correspondingly admit oil above said lifting plunger and to raise the latter.

6. In a deep well pump, a lower cylinder with a lifting plunger therein for raising liquid, a piston rod` for transmitting movement to said lifting plunger, a cylindrical power chamber in line with said rod, a piston .within said chamber and connected to said rod, an outer tubing leading to the earths surface and having walls concentric with said power chamber and in valved communication with said lower cylinder for thedischarge passage of oil upwardly, an inner tube within said outer 'tubing leading from the earths surface and in ported communication with said power chamber at a point beneath said piston, said power cylinder and said outer tube being in ported communication at a point above said piston, and operating means for applying pressure alternately to the liquid within said outer tube and said inner tube whereby said piston is moved respectively `downwardly and upwardly to correspondingly admitoil above said lifting plunger and to raise the latter, said `inner tube beingveccentrically positioned with respect to -said power chamber and the walls of said inner tube and said power chamber being in'contact in one region and having an opening extending through both said walls for said ported communication.

'1. In a deep well pump, a lower cylinder with 'a lifting plunger therein for raising liquid, a pislton rod for transmitting movement to said lifting plunger, a cylindrical power chamber in line withl Asaid power chamber and in valved communication with said lower cylinder for the discharge passage of oil upwardly,'an inner tube within said outer tubing leading from the earths surface and in ported communication with said power chamber at a point beneath said piston, said power cylinder and said outer tube being in ported communication at a point above said piston, and operating means for applying `pressure alternately to the liquid within said outer tube and said.

I said rod, a piston within said chamber and connected to said rod, an outer tubing leading to the earths surface and having walls concentric with said power chamber and in valved communication with said lower cylinder for the discharge passage of oil upwardly, an innerA tube within said outer tubing leading from the earths surface and in ported communication with said power chamberat a point beneath said piston, said power cylinder and said outer tube being in ported communication at a point above said piston, and operating means for applying pressure alternately to the liquid within said outertube and said inner tube whereby -said piston is moved respectively, Vdownwardly and upwardly to correspondingly admit oil above said lifting plunger and to raise the latter, saidinner tube beingeccentricallyposivtioned with respect to said power chamber and the walls of said inner tube and said power chamber being in'contact in one region and having anopening extending through both said walls forsaid ported communication, the upper end-,of

said power chamber extending across'a substantial area of the bore of said inner tube and being -located "above and in the vnear region of said point' of ported communication.

9. In a deep well pumpfa lower cylinder with a lifting plunger therein'for raisingA liquid,` apiston rod for transmitting movement to said lifting plunger, a cylindrical power chamber in line with said rod, a piston within saidchamber and connected to said rod, an outer tubing leading tothe earths surface and having walls concentric with said power chamber and infvalved comniuni- V. cation with said lower cylinderfor the discharge passage of oil upwardly, and an inner tube within said outer tubing leading-from the Iearths surface and in ported communication with said power chamber at `a point beneath said piston, said 'power lcylinder `and said outer tube being in ported communication at a point `above said piston, said`piston rodbeing tubular and providing a passageway lengthwise thereof in ported com` munication with the space above said lifting plunger and the space beneath said piston, land a valve adapted to permit upward movement of liquid through said p passageway and prevent downward movement of liquid 'therethrough durthe downward movement of said piston rod( v 10Q Ina deep well pump, aY lower cylinder with a lifting plunger therein for raising liquid, a

l piston rod for transmitting movement to said lifting plunger, a cylindrical power chamber in line .with said rod, a piston within said chamber and connected to said rod, an outer tube leading to the earths surface and having walls concentric with said power chamber and in valved communication with'said lower cylinder for thevdischarge passage of oil upwardly, and an inner tube within said outer -tube leading from theearths surface and in ported communication with said power chamber at a point beneath said piston, said power cylinder and .said outer tube being yin ported communication at a point abovev said piston, said inner tube beingv eccentrically positioned with respectl to said power chamber and the walls of said inner tube andsaid power chamber being in contact in one region and^having an opening extending through both said walls for e said ported communication, said piston rod being tubular and providingapassagewaylengthwise thereof in ported communication with the space above said lifting plunger and the space beneath said piston, and a valve adaptedr to' permit upt ward movement of liquid through said passageway and prevent downward movement lof liquid therethrough during lthe downward movement of said piston rod.

11. Ina deep well pump, a lower` cylinder with aylifting plunger therein for raising liquid, a piston rod for transmitting movement to said lifting plunger, a cylindrical power chamberin line with said rod, a piston within said chamber and con'- y nected to said rod, anouter'ftubing leading to the earths surface and having walls concentric with said power chamber` and in valved communication with said lower cylinder for the discharge passage ofsoil upwardly, and an inner tube witht in said'outer tubing leading from the earths surface and in ported communication with said' power chamber at a point beneath said piston,` saidlpower cylinder and said outer tube being in ported communication at a point above-said piston, the upperj end of said power chamber extending across a substantial area of the bore of said'inner tube andbeing located above and in the near region of said point of'ported comproviding a ypassageway lengthwise thereof in ported communication with the space -above said f lifting plunger'and the space beneath said piston,

and a valve adapted to permit upward movement of liquid through said passageway and prevent downward movement of liquid therethrough during the downward movement-'of said-piston rod. i l 12. Ina deep well pump, a lower cylinder with a liftingplunger'therein for raising liquid, a "pilston rod for transmitting movement ofsaid lift- .ingplungen a cyllndricalfpower chamber 'in line with said rod, a, piston within saidchamberand connected to said rod, an outer tube leading to the earths surface and having walls concentric v with said powerchamber and in valved communication with said lower cylinder for the discharge passage of oil upwardly, and an innen tube within said outer tube leading from the earths sur- `niunication, said piston rod being tubular and vface andin ported communication with said.-`

-=power chamber ata point beneath said piston, said power cylinder vand said outer tube being in ported communication at a 'point above said piston, said inner tube being eceentrically positioned with respect to said power chamber and the walls of said inner tube and said power chamber being in contact in one region and having an opening extending through both said walls for said ported communication, the upper end of said power chamber extending across a substantial area of the bore of said inner tube andl being located above Aand in the near region of said point of ported communication,'said piston rod being tubular and providing a passageway lengthwise thereof in ported communication with the l with said rod, a piston within said chamber and der and said outer tube being in ported communiconnected to said rod, an outer tubing leading to the earths surface and having walls concentric with said power chamber and in valved communication with said lower cylinder for the discharge of oil upwardly, an inner tube within said outer tubing leading from the earths surface and in ported communication with said power chamber at a point beneath said piston, said power cylinment of liquid through said passageway and prevent downward movement of liqui'dtherethrough during ,they downward movement of said piston rod.

14. In a deep well pump, a lower cylinder with a lifting plunger therein for raising liquid, a piston rod for transmitting movement to said lifting plunger, a cylindrical power chamber in line with said rod, a piston within said chamber and connected to said rod, an outertubing leading to the earths surface and having walls concentric with said power chamber and in valved communication with said lower cylinder for the discharge passage ofl oil upwardly, an inner tube within said outer tubing leading from the earths surfaceA and in -ported communication with said power chamber at a pointbeneath said piston, said power'cylinder and said outer tube being in ported communicationata point above said piston, and operating'means for applying pressure alternately to the liquid within said outer tube and said inner tube wherebysaid piston is moved respectively downwardly and upwardlyto correspondingly admit oil above said lifting plunger and to raise the latter, -said inner tube being; eccentrically positioned with respect to said power chamber and the walls of said inner tube and said power chamber being in contact in one rek gion and having an opening extending through both said walls for said ported communication, said piston'rod being tubular andproviding a pas- `sageway lengthwise thereof in ported communication with the space above said lifting plunger and the spacev beneath said piston, and a valveI adapted to permit upward movement of liquid through said passageway and prevent downward movement of liquid therethrough during the downward movement of said piston rod.

15. In a deep well pump, a lower cylinder with a lifting plunger therein for raising liquid, a piston rod for transmitting movement to said lifting plunger, a cylindrical power chamber in line with said rod, a piston within said chamber and connected to said rod, an outer tubing leading to the earths surface and having walls concentric with said power chamber and in valved communication with said lower cylinder for the discharge passa-ge of oil upwardly, an inner tube within said outer tubing leading from the earths surface and in ported communication with said power chamber at a point beneath said piston, said power cylinder and said outer tube being in ported communication at a point above said piston, and operating means for applying pressure alternately to the liquid within said outer tube and said inner tube whereby said piston is moved respectively downwardly and upwardly to correspondingly admit oil above said lifting plunger and to raise the latter, theupper end of said power chamber extending across a substantial area of the bore of said inner tube and being located above and in the near region of said point of ported communication, said piston rod being tubular and providing a passageway lengthwise thereof in ported communication with the space above said lifting plunger andthe space beneath said piston, and a valve adapted to permit upward movement of liquid through said passageway and prevent downward movement of liquid therethrough during the downward movement of said piston rod.

16. In a deep well pump, a lower cylinder with a lifting plunger therein for raising liquid, a pistn rod for transmitting movement to said lifting plunger, a cylindrical power chamber in line with said rod, a piston within said chamber and connected to said rod, an outer tubing leading ,to the earths surface and having walls concentric with said power chamber and in valved communication with said lower cylinder for the discharge passage of oil upwardly, an inner tube within said` outer tubing leading from the earths surfaceand in ported communication with said power chamber at a point beneath said piston, said power cylinder and said outer tube being in ported communication at a point above said piston, and operating means for applying pressure alternately to the liquid within said outer tube and said inner tube whereby said piston is -moved respectively downwardly and upwardly to correspondingly admit oil above said lifting plunger' and to raise the latter, said inner -tube being eccentrically positioned with respect to said power chamber andthe walls ofsaid inner tube and said power chamber being in contact` in one region and having an opening extendingthrough both said walls for said ported communication, the upper end of said-` power chamber extending across a substantial area of the bore of said inner tube and being located above and in the 'near region of said point of portedncommunication, said pistonrod being tubular and providing a passageway lengthwise thereof in portedvcomf munication with the space above said lifting plunger and the spacel beneath said piston, and

` a valve adapted to permit upward movement of CONRAD REICHERTQ 

